Saw-adjusting device



June 4, 1929. G. w. BRIDGES SAW ADJUSTING DEVICE Filed June 8, 1927 2 Sheen-Sheet mmf attenua# June 4, 1929. Q W BRIDGES 1,716,107 l SAW, ADJUSTING DEVICE Filed June 8, 1927 .2 Sheets-Sheet 2 Patented June 4, 1929.

vrr srt`l1 GEORGE W. BRIDGES, OF MINDEN, LOUISIANA.

SAW-ADJUSTING DEVICE.

Application led June 8, 1927. Serial No. 197,296.

My invention relates to saw adjusting devices, and has particular reference to such a device adapted for use with a two saw one.

man lumber trimmer, whereby the saws may be moved back and forth in relation to each other by power instead of by hand, as is now customary.

lVith the above and other objects in view, my invention consists in the combination and arrangement of parts hereinafter described and claimed, it being understood that, within the scope of what is claimed, changes may be made in the precise embodiment shown without departing from the spirit of the invention. I

ln the drawing:

Figure 1 is a plan view of a portion of a two saw one man lumber trimmer, showing my invention in connection therewith.

Figure-2 is a side view partly in section of a portion of the trimmer showing my invention in connection therewith.

Figure 3 is an end View partly in section and showing the automatic stop.

Figure et is a detail of the foot operated bell cranks.

Figure 5 is a detail of the forked lever.

In the use of a two saw one man lumber trimmer the saws are required tov be separat ed in spaced relation to each other, and it is sometimes `desirable that the relationship yof the saws be varied, for obvious reasons. .Ordinarily the variation is accomplished by means of a crank adapted to operate a rack and pinion or screw whereby the saw heads are moved transversely of the table. My invention is designed to render this operation more facile by using power to accomplish the movement of the saw heads, and to place the control for the power elements in a location convenient for the operator so that he will not have to move himself from his customary operating position in order to adjust the spacing of the saw heads.

Referring now more particularly to the drawings, my invention comprises a frame generally indicated by 1, having slidably journaled thereon a transverse shaft 2; a pair ofl opposing friction bevel wheels 3a,

3b are positioned in spaced relationv inter-l mediate the said shaft 2; a sprocket wheel i is positioned at one end of the said shaft 2; a flanged collar 5 is positioned on the said shaft 2 by means ofy set collars as at 5a; a forked lever 6 is adapted to engage the said fianged collar 5; the said lever being positioned on the vertical shaft 7 journaled in the bracket bearings 8, 8'LL afxed to the said frame 1; an operating handle 9 is positioned on the upper end of the said shaft 7, and eX- tends across and over the said frame 1 so as to be adaptable to be manipulated by the operator of the trimmer.

A shaft 10 is journaled right angularly to the said shaft 2 and has positioned on one side thereof a friction bevel pinion 11 adapted to freely rotate intermediate the said bevel wheels 3 and 3b, and adapted to be alternately engaged by the said bevel wheels 3 anc 3l when the said wheels 3a and 3l are moved transversely with relation to the said bevel pinion 11 whereby one or the other of the said wheels 32L and 3b will come in contact with the said pinion 11. A flanged pulley 12 is mounted intermediate the said shaft 10, and is adapted to be driven from any rotating part of the trimmer 13 as by the belt 14'-, l

The adjusting shaftl of the trimmer saw is ournaled transversely above the frame 1, a sprocket wheel 17 is positioned on the said shaft k15 in line with the aforesaid sprocket wheel la; and a sprocket chain 18 is adapted to engage the said sprocket wheels 17- and 4, whereby rotary motion is communicated from the shaft 2 to the shaft 15.

In the operation of the device, when the operator of the trimmer desires to adjust the spacing of the saws, he moves the handle 9 so as to causev the forked lever 6 to engage the flanged collar 5 whereby the said shaft 2 is caused to have a slight transverse movement relative to the frame 1 and the shaft 10 so as to cause one or the other of the said bevel wheels 3a, 3 to come into contact and engagement with the said bevel pinion 11 whereby rotary motion is communicated from the said pulley 12 and shaft 10 to the said shaft 2 and thence to the adjusting shafts 15 of the trimmer'saws, whereby the said saws are caused to move relative to each other so as tothereby vary the spaced relationship of the said saws.

1t is obvious that if the pulley 12 runs constantly in one direction the shaft 2 may be caused to run inl opposite directions by moving the said shaft to one side or the other, whereby the wheels 3a and 3b are caused to engage opposite sides of the pinion 11.

It is obvious that when the adjustment of the trimmer is accomplishedV by hand the adjustment -may be made very tine and exact without great difliculty, but when the adjustment is made by power, as by my invention, some means should be .provided to will be adapted to move longitudinally thereon. A vplate 25 is positioned on the said trimmer sill 22; the said plate 25`has providedftherein aplurality of slots 26 adapted to have thesaid arm V24 releasably positioned therein. The 'said slots 26 'are provided in spaced relation along the said `plate 25 such that the slots 26-.will engage the said-arm 24 at points' corresponding to predeterminedsettings ofthe saws; in this manner lumber may be trimmed to prede' termined lengths without undergoing the necessity of measuring the distances .between the saws directly; in the embodiment shown slots v26 are provided for trimming lumber to S feet, l0 feet, l2 feet, etc., lengths. At the end ofthe shaft 23, is vpositioned a torsional spring 27 adapted to urge the said.

shaft to rotate. soas Ito cause 'the said arm 24 to engageY the said slots 26.A A crank 28 is positioned at the end of the -shaft 23Y and a dependent'link 29 iszpivotabl-y connected to the -said'crank 23; the lower end of the` link 29 carries a transverse pin 30, adapted to slidably engagethe vertically extending arcuate slotv 31- .provided in the footfoperated bell crank v'32. Under `normal conditions, that is to say, when the arm' 24 isfin vengagement with one. of the said slots 26, the said pin 30 is adapted to engage the upper end of the said slot 31 so as to therebysupport the said .bell crank in the positionl shown in Vfull lines in fFigure 3, so that the arms of theabell'crankrare lthus positioned vertically and horizontally. Two bell .cranks 32 are provided, one on eitherside .of the said link 29,:tl1'e slot 3l Vin-eaohbell` crank being engaged by the pin v30.

The aforesaidfvertical shaft 7 has positionedthereon a double ended crank 33; the bell cranks 32- are pivotably connected to the opposite end of the crank 33`by means of the links 34.

'When it is desired'touse the automatic stop, it is obvious that-the shaft 7 may be turnedftoright orleft by pressing on one or the other vof the saidbell cranks -32 whereby the forked lever 6 is caused to engage the rbwelled collar 5 thereby operating the friction reversing-'mechanism in the man- Asaw to be adjusted to the left.

ner as heretofore described. Thebell crank 32 on the right hand side fwillicause the saw 37 to be adjusted to the right, and the bell crank 32 on theleft hand side will cause the A foot pad 35 is provided on the said bell cranks 32.

hen one of the said cranks 32 have been pressed ydown in the manner described so as to cause the reversing mechanism to operate, and the saw 37 to be moved thereby, the link 29 engaging the upper end of the slot 3l is pulled downwardly, therebyl rotating l the shaft 23 and causingithe arm .24 to be vdisengaged from` the slot 26' ithadpreviously been resting in; inithis manner the arm 24 is adapted to move over the plate 25 the same distance that=the saw 37'moves; the 4movement of the saw `is vcommunicated to the slidable arm 24l by means ofa slot 36.

bell crank, so that the spring 27 may urgev the arm 24 into the said slot '26. At the same time the rotation. ofthe shaft 23 will cause the link 29 to move upwardly, thereby rotating the bell crank 32`so as to causethe link 34to rotatethe said shaft 7 toits neutral position, andthe reversing mechanisml is rendered inoperative. 3l is provided in the bell crank 32 ingorder to permit the. relative movement ofi-the rpin 30 with the bell crank Opposite to the one being used.

One of the saws is represented at 37 in the drawing. It is seated upon aihead 37a which is infturnslidably vmounted upon a splined shaft .40.` A lretractile 'spring 141 is attached at lone end to one lside of the lsaw block 38 asshown at 42, -while thev other end is attached to the end'of the frame. This spring thus serves vtoinormally draw and hold the head 37 atowards that `end of the frame.v A flexible l,cable 43 is attachedat one end to the opposite sidev ofthe-saw block 38 as shownfat E44, while-the other endfvis tiedtothe shaft. l5 as showneat 45,.'-and winds upon or unwindsfrom. thatsh aft. asrthe same rotates in oney directionror Vthe `other.

Thus rotation ofthe'shaft 15 results; in the longitudinal. movement.- ofV the. saw `37. upon the shaft 40. The saw'adjusting mechanism just described for controllingftheHlongitudinal movement1of the saw' 37 upon the shaft V40 is conventional forgeneralfpurposes, and

The arcuate` 1 slot` lock comprising a longitudinally disposed plate positioned on the said frame sill; a plurality of slots provided in the said plate; a longitudinally disposed shaft journaled in the said trimmer frame in spaced relation to the said plate; an arm slidably mounted on the said shaft and adapted to engage the said slots, the said arm rotating with the said shaft; foot operated bell cranks pivoted to the said trimmer frame; a vertically extending arcuate slot provided in the said bell crank; a crank provided on the said shaft; a depending link pivoted to the said cra-nk; a pin extending through the said link adapted to engage the said arcuate slots; a slot provided in the said saw block adapted to engage the said arm; and means for communicating the motion of the said bell crank to the said means for adjusting the spaced relation of the said saws.

2. rlhe combination with a two saw lumber trimmer comprising a trimmer' frame, a frame sill, saw blocks and saws mounted in the said saw blocks of means for adjusting the spaced relation of the said saws comprising a transverse shaft slidably journaled in the said frame, a pair of opposing friction bevel wheels mounted in spaced relation on the said shaft; a friction bevel pinion journaled in the said frame intermediate the said bevel wheels; means for causing the rotation of the said pinion; means for releasably engaging the said pinion with either one of of the said bevel wheels, whereby the said transverse shaft may be caused to rotate in one direction or the other, the said means comprising a vertical shaft journaled in the said trimmer frame; a collar positioned on the said transverse shaft, a forked lever positioned on the said vertical shaft and adapted to engage the said collar; means for transmitting the rotation of the said transverse shaft to the said saws; in connection with a releaseable lock comprising a longitudinally disposed plate positioned on the said frame sill; a plurality of slots provided in the said plate; a longitudinally disposed shaft journaled in the said trimmer frame in spaced relation to the said plate; an arm slidably mounted on the said shaft and adapted to engage the said slots, the said arm rotating with the said shaft: foot operated bell cranks pivoted to the said trimmer frame; a vertically eXtending arcuate slot provided in the said bell crank; a crank provided on the said shaft; a depending link pivoted to the said crank; a pin extending through the said link adapted to engage the said arcuate slots; a slot provided in the said saw block adapted to engage the said arm; and means for communica-ting the motion of the said bell cranks to the said vertical shaft.

In testimony whereof I affix my signature.

l GEORGE W. BRIDGES. 

